Diamond



FIG. 1 is a top perspective view of a diamond showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a bottom plan view;

FIG. 4 is a front side plan view, the rear plan view being a identical; and,

FIG. 5 is a right side plan view, the left side plan view being identical.

The portions of the diamond shown in broken lines in the Figures are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a diamond, shown and described in the drawings. 